/* Qianmiao (Michelle) Chen — personal website
   Fonts: Source Serif 4 and EB Garamond (SIL Open Font License), hosted in /fonts */

@font-face { font-family: "Source Serif 4"; font-style: normal; font-weight: 400; font-display: swap;
  src: url("../fonts/source-serif-4-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "Source Serif 4"; font-style: italic; font-weight: 400; font-display: swap;
  src: url("../fonts/source-serif-4-latin-400-italic.woff2") format("woff2"); }
@font-face { font-family: "Source Serif 4"; font-style: normal; font-weight: 600; font-display: swap;
  src: url("../fonts/source-serif-4-latin-600-normal.woff2") format("woff2"); }
@font-face { font-family: "Source Serif 4"; font-style: italic; font-weight: 600; font-display: swap;
  src: url("../fonts/source-serif-4-latin-600-italic.woff2") format("woff2"); }
@font-face { font-family: "EB Garamond"; font-style: normal; font-weight: 500; font-display: swap;
  src: url("../fonts/eb-garamond-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: "EB Garamond"; font-style: italic; font-weight: 500; font-display: swap;
  src: url("../fonts/eb-garamond-latin-500-italic.woff2") format("woff2"); }

:root {
  --ink: #1f2328;          /* main text */
  --muted: #5f6670;        /* secondary text */
  --faint: #8a9099;        /* small labels */
  --rule: #e3e1dc;         /* thin lines */
  --accent: #1d3a5f;       /* deep navy: links, name */
  --accent-soft: #eef2f7;  /* light tint for hover */
  --paper: #fdfcfa;        /* page background */
  --body: "Source Serif 4", "Iowan Old Style", Georgia, "Noto Serif CJK SC", "Songti SC", serif;
  --display: "EB Garamond", "Garamond", Georgia, serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.65;
  font-feature-settings: "kern", "liga", "onum";
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(29, 58, 95, 0.25); transition: border-color .15s, background-color .15s; }
a:hover { border-bottom-color: var(--accent); }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

.wrap { max-width: 860px; margin: 0 auto; padding: 0 28px; }

/* ---------- header ---------- */
.site-header { border-bottom: 1px solid var(--rule); }
.site-header .wrap { display: flex; align-items: baseline; justify-content: space-between; gap: 24px; padding-top: 26px; padding-bottom: 18px; flex-wrap: wrap; }
.site-name { font-family: var(--display); font-weight: 500; font-size: 24px; letter-spacing: .01em; color: var(--ink); border: 0; }
.site-name:hover { color: var(--accent); }
.site-nav { display: flex; gap: 26px; flex-wrap: wrap; }
.site-nav a { font-size: 13px; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); border: 0; padding-bottom: 3px; border-bottom: 1px solid transparent; }
.site-nav a:hover { color: var(--accent); }
.site-nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--ink); }

main { padding: 56px 0 72px; }

/* ---------- headings ---------- */
h1, h2, h3 { font-family: var(--display); font-weight: 500; color: var(--ink); line-height: 1.2; }
h1 { font-size: 44px; margin: 0 0 6px; letter-spacing: -.005em; }
.page-title { font-size: 40px; margin: 0 0 8px; }
.page-lede { color: var(--muted); margin: 0 0 40px; font-size: 17px; }
h2 { font-size: 15px; font-family: var(--body); font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--accent);
  margin: 52px 0 22px; padding-bottom: 10px; border-bottom: 1px solid var(--rule); }
h2:first-child { margin-top: 0; }

/* ---------- home ---------- */
.intro { display: grid; grid-template-columns: 260px 1fr; gap: 48px; align-items: start; }
.portrait { width: 100%; height: auto; display: block; border-radius: 2px; filter: saturate(.95); }
.contact { list-style: none; margin: 22px 0 0; padding: 18px 0 0; border-top: 1px solid var(--rule); font-size: 15px; }
.contact li { padding: 0 0 12px; line-height: 1.4; }
.contact .label { display: block; font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--faint); margin-bottom: 2px; }
.contact a { border-bottom-color: transparent; word-break: break-word; }
.contact a:hover { border-bottom-color: var(--accent); }
.intro-main h1 { margin-top: -6px; }
.role { font-size: 18px; color: var(--muted); margin: 0 0 22px; }
.role strong { color: var(--ink); font-weight: 600; }
.bio p { margin: 0 0 14px; }
.links { list-style: none; padding: 0; margin: 22px 0 0; display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 15px; }
.links a { border-bottom-color: transparent; }
.links a:hover { border-bottom-color: var(--accent); }
.links .sep { color: var(--rule); }

.fields { margin: 6px 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.fields li { font-size: 14.5px; color: var(--ink); background: #f3f1ec; border-radius: 2px; padding: 3px 11px; }

.edu { list-style: none; margin: 0; padding: 0; }
.edu li { display: grid; grid-template-columns: 1fr auto; gap: 16px; padding: 7px 0; }
.edu .degree { font-weight: 600; }
.edu .school { color: var(--muted); }
.edu .year { color: var(--faint); font-variant-numeric: tabular-nums; }

.featured { margin: 0; }

/* ---------- papers ---------- */
.papers { list-style: none; margin: 0; padding: 0; }
.paper { padding: 0 0 26px; }
.paper + .paper { padding-top: 0; }
.paper-title { font-weight: 600; font-size: 17.5px; line-height: 1.4; color: var(--ink); }
a.paper-title { color: var(--ink); border-bottom: 1px solid var(--rule); }
a.paper-title:hover { color: var(--accent); border-bottom-color: var(--accent); }
.paper-meta { color: var(--muted); font-size: 15.5px; margin-top: 3px; }
.paper-meta em { color: var(--ink); }
.status { font-style: italic; color: var(--muted); }
.paper-actions { margin-top: 6px; display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: 14px; align-items: baseline; }
.paper-actions a { border-bottom-color: transparent; letter-spacing: .02em; }
.paper-actions a:hover { border-bottom-color: var(--accent); }

details { margin: 0; }
details > summary { list-style: none; cursor: pointer; color: var(--accent); font-size: 14px; letter-spacing: .02em; display: inline; }
details > summary::-webkit-details-marker { display: none; }
details > summary::after { content: " +"; color: var(--faint); }
details[open] > summary::after { content: " –"; }
details > summary:hover { text-decoration: underline; text-underline-offset: 3px; }
.abstract { margin: 10px 0 4px; padding: 2px 0 2px 18px; border-left: 2px solid var(--rule); color: #3b4148; font-size: 15.5px; line-height: 1.65; }
.paper-actions details[open] { flex-basis: 100%; order: 10; }

.wip li { padding: 0 0 12px; }
.wip .paper-title { font-weight: 400; }

.pubs .paper-title { font-weight: 400; }

/* ---------- teaching ---------- */
.course { padding: 0 0 22px; }
.course-head { display: grid; grid-template-columns: 1fr auto; gap: 16px; align-items: baseline; }
.course-name { font-weight: 600; }
.course-term { color: var(--faint); font-size: 15px; white-space: nowrap; }
.course-meta { color: var(--muted); font-size: 15.5px; }
.school-label { font-family: var(--display); font-size: 21px; margin: 6px 0 14px; color: var(--ink); }

.note { color: var(--muted); }

.cv-box { border: 1px solid var(--rule); padding: 28px 30px; background: #fff; }
.button { display: inline-block; font-family: var(--body); font-size: 14px; letter-spacing: .1em; text-transform: uppercase; color: #fff; background: var(--accent); border: 0; padding: 11px 20px; border-radius: 2px; }
.button:hover { background: #142a46; border: 0; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--rule); color: var(--faint); font-size: 13.5px; }
.site-footer .wrap { padding-top: 22px; padding-bottom: 34px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.site-footer a { color: var(--muted); border-bottom-color: transparent; }

/* ---------- small screens ---------- */
@media (max-width: 720px) {
  body { font-size: 16.5px; }
  .wrap { padding: 0 20px; }
  .site-header .wrap { flex-direction: column; gap: 10px; padding-top: 20px; padding-bottom: 14px; }
  .site-nav { gap: 18px; }
  main { padding: 36px 0 56px; }
  .intro { grid-template-columns: 1fr; gap: 26px; }
  .profile { display: grid; grid-template-columns: 130px 1fr; gap: 20px; align-items: end; }
  .contact { margin: 0; padding: 0; border-top: 0; font-size: 14.5px; }
  .contact li { padding-bottom: 8px; }
  h1 { font-size: 36px; }
  .page-title { font-size: 34px; }
  .edu li, .course-head { grid-template-columns: 1fr; gap: 0; }
}

@media print {
  .site-header, .site-footer { display: none; }
  details > * { display: block; }
  body { background: #fff; }
}

.subhead { font-size: 13px; letter-spacing: .12em; text-transform: uppercase; color: var(--faint); margin: 10px 0 18px; }